1 int __cdecl main(int argc, const char **argv, const char **envp)

 2 {

 3   void *v3; // eax

 4   int v4; // edx

 5   void *v5; // eax

 6   int result; // eax

 7   void *v7; // eax

 8   void *v8; // eax

 9   void *v9; // eax

10   size_t i; // [esp+4Ch] [ebp-8Ch]

11   char s[4]; // [esp+50h] [ebp-88h]

12   char input[28]; // [esp+58h] [ebp-80h]

13   char v13; // [esp+74h] [ebp-64h]

14

15   v3 = (void *)print_402B30(&unk_446360, "Give me your flag:");

16   sub_4013F0(v3, (int (__cdecl *)(void *))sub_403670);

17   scanf_401440((int)&dword_4463F0, v4, (int)input, 127);

18   if ( strlen(input) < 30 && strlen(input) > 4 )

19   {

20     strcpy(s, "EIS{");

21     for ( i = 0; i < strlen(s); ++i )

22     {

23       if ( input[i] != s[i] )                   // 输入前四位为：EIS{

24       {

25         v7 = (void *)print_402B30(&unk_446360, "Sorry, keep trying! ");

26         sub_4013F0(v7, (int (__cdecl *)(void *))sub_403670);

27         return 0;

28       }

29     }

30     if ( v13 == '}' )                           // 输入的最后一位

31     {

32       if ( sub_4011C0(input) )                  // 关键函数

33         v9 = (void *)print_402B30(&unk_446360, "Congratulations! ");

34       else

35         v9 = (void *)print_402B30(&unk_446360, "Sorry, keep trying! ");

36       sub_4013F0(v9, (int (__cdecl *)(void *))sub_403670);

37       result = 0;

38     }

39     else

40     {

41       v8 = (void *)print_402B30(&unk_446360, "Sorry, keep trying! ");

42       sub_4013F0(v8, (int (__cdecl *)(void *))sub_403670);

43       result = 0;

44     }

45   }

46   else

47   {

48     v5 = (void *)print_402B30(&unk_446360, "Sorry, keep trying!");

49     sub_4013F0(v5, (int (__cdecl *)(void *))sub_403670);

50     result = 0;

51   }

52   return result;

53 }

 1 bool __cdecl sub_4011C0(char *a1)

 2 {

 3   size_t v2; // eax

 4   signed int v3; // [esp+50h] [ebp-B0h]

 5   char str[32]; // [esp+54h] [ebp-ACh]

 6   int v5; // [esp+74h] [ebp-8Ch]

 7   int j; // [esp+78h] [ebp-88h]

 8   size_t i; // [esp+7Ch] [ebp-84h]

 9   char s_mid[128]; // [esp+80h] [ebp-80h]

10

11   if ( strlen(a1) <= 4 )

12     return 0;

13   i = 4;

14   j = 0;

15   while ( i < strlen(a1) - 1 )

16     s_mid[j++] = a1[i++];

17   s_mid[j] = 0;

18   v5 = 0;

19   v3 = 0;

20   memset(str, 0, 0x20u);

21   for ( i = 0; ; ++i )

22   {

23     v2 = strlen(s_mid);

24     if ( i >= v2 )

25       break;

26     if ( s_mid[i] >= 'a' && s_mid[i] <= 'z' )

27     {

28       s_mid[i] -= 32;                           // 小写转大写

29       v3 = 1;

30     }

31     if ( !v3 && s_mid[i] >= 'A' && s_mid[i] <= 'Z' )

32       s_mid[i] += 32;                           // 大写转小写

33     str[i] = byte_4420B0[i] ^ sub_4013C0(s_mid[i]);// 异或

34     v3 = 0;

35   }

36   return strcmp("GONDPHyGjPEKruv{{pj]X@rF", str) == 0;

37 }

 1 date1=[ 0x0D, 0x13, 0x17, 0x11, 0x02, 0x01, 0x20, 0x1D, 0x0C, 0x02,

 2   0x19, 0x2F, 0x17, 0x2B, 0x24, 0x1F, 0x1E, 0x16, 0x09, 0x0F,

 3   0x15, 0x27, 0x13, 0x26, 0x0A, 0x2F, 0x1E, 0x1A, 0x2D, 0x0C,

 4   0x22, 0x04]

 5 # s=inpt(a1 ^ 0x55) + 72

 6 s='GONDPHyGjPEKruv{{pj]X@rF'

 7 s=list(s)

 8 t=''

 9 for x in range(len(s)):

10     c=chr(((ord(s[x])^date1[x])-72)^0x55)

11     if c.islower():

12         t+=c.upper()

13     else:

14         t+=c.lower()

15

16 print('EIS{'+t+'}')